The driver of the truck was spoken to by police but officers were still putting together what had happened before charges would be considered, Dickson said.
WorkSafe New Zealand had been notified, as had the coroner.
Dickson appealed to any witnesses to the crash to contact Acting Sergeant Nick Owen at Whangārei Police Station.
Northland's road toll for 2019 stands at 20 and includes the death of a 10-year-old boy hit by a truck as he was crossing Kamo Rd on his way to school in Whangārei in June.
Meanwhile, a 45-year-old Bay of Islands man has been seriously injured in a motorcycle accident on State Highway 11 near Opua.
The crash occurred about 3.15pm yesterday on a bend near the English Bay Rd intersection with the Harley-Davidson rider suffering suspected spinal injuries.
The highway was closed temporarily and the rider transported to Paihia, where he was airlifted from the school grounds to Whangārei Hospital by the Northland Rescue Helicopter.
Police, Paihia Fire Brigade, St John Ambulance and a local GP responded. No other vehicles are thought to have been involved.